score:4
First of all, the commentary to that sutta doesn't use the term 'niyatamicchādiṭṭhi' for the sixth abhithana, it uses the term 'aññasatthāruddesa', which means 'proclaiming another teacher', i.e. setting oneself up as a student of a teacher with views outside of the Buddha's teaching, something an enlightened being cannot do (abhabba kātuṃ).
As to what the term 'niyatamicchādiṭṭhi' (pernicious wrong belief) means, the MN tika says:
ahetukadiṭṭhiakiriyadiṭṭhinatthikadiṭṭhiyova niyatabhāvaṃ pattā niyatamicchādiṭṭhidhammā.
Views such as the view of causelessness, the view of non-action, or the view of nihilism, when fallen into a state of certainty are called states of pernicious wrong view.
(MN-t 22)
Basically, the meaning is that any wrong view becomes 'pernicious' when it is clung to as a certainty.
Upvote:1
If you commit any of the 1st 5 (panchanathariya) you still can liberate your self from Samsara. If you have committed the 5 grave offenses, you will get definite results in the next birth. Most likely result is that you will be born in Avichi Hell. (Ajasath being a exception after doing so much good after words. ) At some stage this karma will end and by practicing the Dhamma you can come out of Samsara.
If you hold on to wrong views and do not practice the Dhamma. Then there is no way out of Samsara.
In order to practice of course your should have confidence in the teacher, the practice and your ability to practice and get results. If your faith is else where your will not practice the path leading you out of Samsara (you will be going something else instead), hence will be struck in it for ever, even though someone have done a grave offence in a part life can get enlightened in a later life getting inspired to practice the right path leading out of Samsara.